I just purchased 2 helix g2n di units for the bow. And 1 helix 10 g2n mega si and 1 helix 9 2gn mega si for console. I have the Ultrexx tm and 360. I want 2 units in front to run off one transducer and I want 2 units at console to run off 1 transducer but I want them all to share mapping if possible. How do I accomplish this? Thank you so much.